一种评价沥青混合料疲劳性能的简单试验方法

摘要

使用间接拉伸（IDT）试验来评估沥青混合料的疲劳行为。再生混凝土集料（RCA）和新集料以不同比例（0％，20％，40％，60％，80％和100％）混合生成具有不同抗疲劳性能的混合料。为了表征疲劳，在中温下进行循环加载 IDT 和单调加载断裂能试验。结果表明，在中温下，循环加载 IDT 试验获得的疲劳寿命和单调加载断裂试验获得的断裂能之间具有良好的相关性。基于实验室结果，单调加载 IDT 试验得到的断裂能可以用于快速评估沥青混合料疲劳性能。考虑到 IDT 试验已经用于表征沥青混合料的低温开裂和水敏感性，采用单调加载的 IDT 试验评价沥青混合料的疲劳性能易于推广使用。%This study uses the indirect tensile (IDT)test to evaluate fatigue behavior of as﹣phalt.Recycled concrete aggregate(RCA)and virgin aggregate are blended at different percentages(0%, 20%,40%,60%,80%,and 100 %)to produce mixes with a variety of fatigue performance.To charac﹣terize fatigue,cyclic IDT and monotonic fracture energy tests were performed at intermediate tempera﹣tures.At intermediate temperatures,good correlation is found between the fatigue life obtained from cyclic IDT test results and the fracture energy obtained from monotonic fracture test results.Based on the labora﹣tory test results,the IDT test can be used to evaluate both the fatigue behavior of asphalt con﹣crete.Considering that IDT testing has been used to characterize thermal cracking and moisture suscepti﹣bility,the IDT test has the potential to serve as a single performance test for fatigue,thermal cracking and moisture damage.